Phys. Rev. B 70, 172415 (2004) [4 pages]Phase diagram of the two-leg Kondo ladderReceived 5 March 2004; revised 22 April 2004; published 23 November 2004 The phase diagram of the two-leg Kondo ladder is investigated using computational techniques. Ferromagnetism is present, but only at small conduction electron densities and robust Kondo coupling J. For densities n≳0.4 and any Kondo coupling, a paramagnetic phase is found. We also observed spin dimerization at densities n=1∕4 and n=1∕2. The spin-structure factor at small J peaks at q⃗=(2n,0)π for n≲0.5, and at q⃗=(n,1)π for n≳0.5. The charge structure factor suggests that electrons behave as free particles with spin -1∕2 (spin-0) for small (large) J. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.172415
DOI:
10.1103/PhysRevB.70.172415
PACS:
75.30.Mb, 71.10.Pm, 75.10.−b
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